Benchmarks for choosing the right CPU
There are several standard blend files provided by the Blender Foundtation for testing and benchmark purposes available at Demo Files. The BMW scene as become a common test scene for various purposes.

In recent years due to the popularity and it has become an informal benchmark tool used by hardware manufacturers to provide a common ground for comparison. This has the advantage of using real world computational needs rather than artificial benchmark tools created for the sole purpose of testing

As such the Blender foundation has started a new initiative to provide an official reliable benchmarking tool for testing purposes.

This has materialized as a website called Blender Open Data that aims to collect performance data for various hardware configurations.

As of November 2018 status is still in beta testing, so not much information is available at the moment.